Boiler-economizer.



F. SARGENT & D. S. JACOBUS.

BOILER monomznn.

APPLICATION FILED JULY 16, 1912 1,048,739, Patented Dec. 31, 1912.

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INVENTORS,

WITNESSES: v

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Patented Dec. 31, 1912.

l I I l L r 1 l l ll BOILER ECONOMIZBR. APPLICATION FILED JULY 10. 1912.

WITNESSES:

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P. SARGENT & D. SfJACOBUS.

BOILER ECGNOMIZER.

APPLIOATION FILED JULY 10, 1912.

1,048,739., Patented Dec. 31, 1912.

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. UNITED STATES PATENT OFFICE- FREDERICK SARGENT, OF CHICAGO, ILLINOIS,AND DAVID S. JACOBUS, OF JERSEY CITY, NEW JERSEY, ASSIGNORS TO THEBABCOCK & WILCOX COMPANY, OF BA- YONNE, NEW JERSEY, A CORPORATION OF NEWJERSEY.

BOILER-EGONOMIZERL Specification of Letters Patent.

IatentetlDee. 31,1912.

Application filed July 16, 1912. Serial No. 709,774.

To all whom it may concern Be it known that we, FREDERICK SARGEN'I, acitizen of the United States, and a resident of Chicago, in the countyof Cool: and State of Illinois, and I).\VII) S. Jaconvs, a citizen ofthe United States, and a resident of Jersey City, in t he county ofHudson and State of New Jersey, have invented certain new and usefulImprovements in Boiler- Economizers, of which the following is aspecification.

The purpose of an economizer is to preheat the boiler feed water, or toheat water 'for other purposes, and is placed in the line between theboiler, or other source of waste heat, and the stack; that is, aneconomize! is used to recover from the gases of combustion, heat thatwould otherwise escape through the stack. An econo-mizer in realityforms an extension of the heating sur-' face proper, but it is moreeffective for the transfer of heat than the last pass of the boilerheating surface, because of the lower temperature of the contents; itbeing wellknown that boiler surface does not extractheat from the gasesonce they have ap-' proached a temperature corresponding to the steampressure in the boiler.

The advantages of an economizer in utilizing the heat of the escapinggases are well-known; but in its development it has been ascertainedthat increasing the velocity of a given weight of gases in making themtlow over a given amount of surface, increases the heat transfer rateand the elliciency. To utilize this principle, the gases must be given along travel over the econo- IlliZQI' tubes either by the use of balllesfor contracting the cross sectional area of the path of the gases, or bythe use of a relatively long and narrow cconomizcr. For a minimumdra't't resistance the best results are obtained by the use of a longand narrow economizer, as the gases then travel in a straight paththrough the eelmoi'nizcr and the resistance of turns and bends in thepath of the gases is eliminated. in modern power plant practice, whereeconomy of door space is an important item, it is practically impossibleto install economizers to advantage of a length sullicient to give thebest heat transfer results if it were attempted to do this in theordinary way.

.-The object of the present invent-ion therefore, is to provide a meanswhereby the advantages attaching to a long and narrow eeonomlzer may beattained where economy of floor space is a desideratum. I

In carrying out our invention we place the economizers in pairs aboveand transversely of the boilers, and the gases from two boilers aremadeto pass in opposite directions through the economizers and thence toexhaust fans, from which they are discharged through llues leading tothe stack.

The invention will be understood by reference to the accompanyingdrawings in Figure 1 is a side view of a boiler setting having ourarrangement of eeonomizers;

llig Z, a top view and Fig. 3, a front view. We have shown In thedrawings a pair of boilers spaced apart. In a plant having more than twoboilers they would be arranged in two lines in pairs, a pairconstituting a, unit, and as they are similar in construction andarrangement it will only be necessary to refer to one pair. Each unitcomprises two boilers l and 2, the boilers being set back to back asshown in the drawings although this is not essential, that is, thefiring doors may be at the front, rear or sides as may be desired in anyparticular installation. Again, the boilers may be set so that there nospace between them. Ilaccd side by side above and transversely of theboilers and spanning any space that may be left between them, are twoeconomixers 3 and 4. The 'asl'c gases from boiler 2 pass upward througha flue 5 to the economizcr inlet, lhcnce through the economize! 3 lo afan (i at a point above the trout of boiler 1, from which they aredischarged into a llue 7 and finally into lhe stack 9 througha.connecting fine 8. The gases from boiler 1 pass upward through a llucl0, thence through economize! 4 to a fan ii at a point above the frontof boiler 2, from which they are discharged into a line 12 and passthrough a (amneelin-g llue 13 to stack 9.

\Vith the arrangement above proposed it is possible to have a compactand ell'eclive economizer arrangement with a minimum amount of lloorspace. The gases are led through the economizers in opposite direetionswith a minimum number of turns, and may be discharged from the fans intothe fines 7 and l2 in the direction in which they travel in the saidfines, so that there is no undue loss through not utilizing the velocityof the gasesimparted by the fans, the I'fans being placed directly undersaid flues.

It .is possible, as shown by the drawings, to install a series ofeconomizers in the way indicated and maintain the advantages secured ina single unit.

What we claim is 1. 'A boiler unit comprising two boilers spaced apart,an economizer for each boiler placed above and spanning the boilers,andflues for conducting the gases from the boilers to the'economizers,and from the economizers to a common stack.

- 2. A boiler unit comprising two boilers, an economizer for each boilerplaced above and spanning the boilers, and fines for direnting the gasesfrom the boilers through and transversely of the boilers andspanningthem, and flues connecting each boiler with its economizer soas'to cause the ,gases to travel the'economizers in opposite directions.

5. A boiler unit comprising two boilers, an economizer for each .boilerplaced above and transversely of the boilers and spanning them,fiuesconnecting each boiler with its economizer, the outlet of eacheconomizer being at a point abovethe other boiler, flues into which thegases discharge from the general direction in economizers,rsaiddischarge 'flues directing the gases to a common stack in the directionin which they travel in the flues.

' 6. A boiler unit comprising two boilers, an economizer for each boilerplaced above and transversely of the boilers and spanning them,fluesconnecting each boiler with itseconomizer, the outlet of each economizerbeing at a point above the other boiler, lines into which "the gasesdischarge from the economizers, a fan in each of the discharge flues,said fans forcing the gases to a common stack in the direction in whichthey travel in the flues.

7. A boiler unit comprising two boilers,-

an economizer foreach boiler placed above and spanning the boilers, andfines for C011". from the boilers to theducting the gases economizers,and from thence to a stack.

8. A boiler unit comprising twoboilers, an economizer for each boilerplaced above and spanning the boilers, flues for conducting the gasesfrom the boilers to the economiz ers, a fan attached-to the dischargefine of each economizer, said fans forcing the gases to flues'leadingtoa stack in the same the fines.

which they travel in In testimony" whereof we have hereunto signed ournames 1n the presence of two subscribing witnesses. 1 y FREDERICKSARGENT.

DAVID S. JAGOBUS. Witnesses to Frederick Sargents signature:

R. J. Smssan, M. WOOLLEY. Witnesses to David S. J acobu signature:

' W. T. FLEMING,

E. P. TERRY.

Copies of this patent may be obtained for five cents each by addressingthe Commissioner of liitents,

Washington, D. 0.

